Earth leakage protection device and system with switchable protection modes, and alternating current charging pile

The utility model discloses a protection mode switchable electric leakage protection device and system and an alternating current charging pile, the electric leakage protection device is provided with a first output pin and a first input pin, the first input pin is used for receiving external input signals, the external signals comprise a first signal or a second signal, and the first output pin is used for outputting an electric leakage early warning signal; the leakage protection device further comprises a mode switching circuit, the mode switching circuit is connected with the first input pin and the first output pin, the mode switching circuit is switched to a first protection mode when receiving the first signal, and the mode switching circuit is switched to a second protection mode when receiving the second signal. And an electric leakage early warning signal corresponding to the first protection mode or an electric leakage early warning signal corresponding to the second protection mode is output throu